ditz issue update
testcase for duk_push_sprintf() va_list reuse: needs a rather long format/result string to trigger, but this has been verified to trigger the issue at least on 64-bit gcc 4.6.3 (GH-10)
add a DUK_VA_COPY() wrapper for non-portable va_copy()
fix duk_push_sprintf() va_list reuse by using DUK_VA_COPY() (GH-10)
portability notes on va_copy() and missing/broken platform functions
release note update
testcase attribution
Merge branch 'va-copy-fix'